doubler



(No Model.)

J. W. H. DOUBLBR.

CHAIR.

No. 317,933. Patented May 12,1885.

UNITED STATES PATENT OFFICE..

JGHN XV. H; DOUBLER, OF ROOKFORD, ILLINIS.

4CHAIR.

SPECIFICATION forming part of Letters Patent No. 317,933, dated May 12,1885.

Application filed September 8, 1884. (No model.)

.To all whom it may concern:

Be it known that I, JOHN W. H. DoUBLEn, a citizen of the United States,residing in the city of Rockford, in the county of Winnebago and Stateof Illinois, have invented a new and useful Chair, of which thefollowing is a specifica-tion.

Thisinvention relates to rockingchairs of that class mounted to rock ona pedestal. Its object is to produce a well-balanced rocker without theuse of springs, and to so connect the rocker with the pedestal that inlifting, shifting, or handling the chair it will not separate from thebase, and to limit its rocking m ove1nent,so as to prevent overtippingordisplacement of the rocker on its pedestal. These and otherimprovements, all of which will be hereinafter more fully described,constitute the subject-matter of this specification.

In the accompanying drawings, Figure l is an isometrical representationof a chairembodying my invention. Fig. 2 is a side elevation. Fig. 3 isa vertical section eut lengthwise of the sides of the pedestalbase andabout on the vertical plane of the inner face thereof, and Fig. 4 is anisometrieal representation of the toothed racks.

In the figures, A represents the side, land B the transverse bars, ofthe pedestal,which are of the usual form, framed and joined in t-he`usual manner, producing a pedestal, substantially such as are now inuse, and to be found in the trade.

The frame proper of the chair consists of like side frames composed ofpillars C, rockers D ,front pillars, E, and arms F, suitably framed andjoined to each other, and are supported and held in their separatedrelative position by means of suitable transverse bars framed orotherwise securely fixed to the side frames, producing` a main framesubstantially the same as chair-frames now in use and to be found in thetrade, except in the relative position and curve of the rockers. i,

The face of the rocker D of my improved chair, designed to engage theupper face of the pedestal, is produced in a regular varying curveincreasing in curvature from its forward end rearward, substantially inthe segment of an ellipse, as clearly shown in Figs. 2 and 3. By thisform of rocker I am enabled to produce a chair in which the rockingmovement will be more nearly uniform throughout its entire movement thancan be obtained by the employment of a segmentrocker in which the curveis substantially regular or uniform throughout. In the employment ofthis varying curvature of the rocker I ani enabled to produce a chairequally balanced under the varying weights of parties requiring its use.

At H is represented a gear-toothed rack, preferably with gearteeth c ofthe peculiar form shown at Fig. 2, having their pitch-line and greatestdimensions at or near their peripheral face. This toothed rack H is provided with a pendant, b, depending from the central portionof its loweredge, and from the lower end of its inner faeeproj ects a pin-stud, c.The outer face of this rack is fixed to the inner face of the sides A ofthe pedestal by means of screws or otherwise, and preferably in suchposition thereon that the face ends of the teeth shall be slightly belowthe rockingsurface of the pedestal.

At I is represented a segment-toothed rack of a regular varyingcurvature to conform to the curve of the rocker D. The teeth d of thisrack are of the peculiar V form represented in Fig. 4, having theirpitch-line and greatest dimensions on its inner curved surface formingthe base of the teeth. The pitch of the teeth of this segment, and ofthe toothed rack H, are such that they shall engage each other in therocking movement with the least praetical lost motion, to preventendwise and sidewise movement of the rocker on the pedestal. Thistoothed segment I is provided with a camformed loop, K, dependingcentrally from its lower edge, and of a conformation to receive thestud-pin c of the rack-bar II in a manner to permit a limitedback-and-forth free rocking movement of the chair, and serves to hold itin position on the pedestal to prevent accidental displacement, and tohold the parts together in handling. This toothed segment I is fixed inposition in this instance to the central portion, L, of the chairdepending below the rockers, and in such a manner that its curved innerface shall engage the rockingsurface on its inner-edge portion.

From the foregoing it will be seen that in this construction andarrangement of the paris ICO the curved surface of the rocker engagesthe l the connection of the cam-formed loop with the stud-pin operatesto prevent displacement and limit the throw of the rocker.

At Nis represented a shield or guard-plate, fixed to the outer face ofthe rocker to overlap the joint between the rocker and the pedestal, toprevent the clothesof the occupant entering between them. It willfurther be seen that the curved rear portion of the rockers D risesabove the seat portion L of the chair, as shown in the dotted lines atFig. 2. By this construction, in connection with the peculiar curve ofthe rocker, I am enabled to produce a rocker better balanced and betteradapted to occupants ofvarious weights than any eh air known to me. Inthis instance I have shown and described the rocker of my improved chairas consisting` in its peculiar construction and placed upon the chairabove the seat, at

its rear end, all of which I prefer, but do not wish to confine myselfstrictly to these particulars, as substantially the same results may beobtained by a rocker varying slightly in its curvature, and maybe placedhigher or lower upon the chair and still be within the scope of myinvention so long` as the chair is held balanced upon the pedestal andlimited in its rocking movement thereon, substantially as hereinbeforestated.

I am aware that it is not broadly new to combine a rack and toothedsegment with a pedestal chair; hence I do not broadly claim such acombination; but

I claim as my invention- The combination,with a pedestal, and with achair mounted thereon, of a toothed rack fixed to the pedestal and atoothed segment fixed to the chair and provided with depending` loops toengage inwardly-projecting pins of the pedestal, substantially as setforth.

JOHN XV. H. DOUBLER.

Vitnesses:

JACOB BEHEL, A. O. BEHEL.

